Display device

ABSTRACT

The disclosure provides a display device including a first display panel and a second display panel. The second display panel is disposed above the first display panel. The first display panel includes a first pixel unit. The first pixel unit includes a first sub-pixel and a second sub-pixel, where the first sub-pixel and the second sub-pixel are connected in parallel. The display device of the disclosure has better yield.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefit of China application serialno. 201910984747.8, filed on Oct. 16, 2019. The entirety of theabove-mentioned patent application is hereby incorporated by referenceherein and made a part of this specification.

BACKGROUND Technical Field

The disclosure relates to an electronic device, in particular to adisplay device.

Description of Related Art

With the rapid development of electronic products, the displaytechnology used in electronic products is also constantly improved. Thedisplay device is constantly improving towards better display effect.

SUMMARY

The main purpose of this disclosure is to provide a display device withbetter quality.

According to the embodiments of the disclosure, a display deviceincludes a first display panel and a second display panel. The seconddisplay panel is disposed above the first display panel. The firstdisplay panel includes a first pixel unit. The first pixel unit includesa first sub-pixel and a second sub-pixel, where the first sub-pixel andthe second sub-pixel are connected in parallel.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are included to provide a furtherunderstanding of the disclosure, and are incorporated in and constitutea part of this specification. The drawings illustrate embodiments of thedisclosure and, together with the description, serve to explain theprinciples of the disclosure.

FIG. 1 is a schematic cross-sectional view of a display device accordingto an embodiment of the disclosure;

FIG. 2 is a schematic exploded view of a display device according to anembodiment of the disclosure;

FIG. 3 is a schematic exploded view of a display device according toanother embodiment of the disclosure;

FIG. 4A is a schematic view of a first pixel unit according to anembodiment;

FIG. 4B is a schematic view of a first pixel unit of FIG. 4A without acommon electrode and a common line;

FIG. 5 is a schematic view of a first pixel unit according to anotherembodiment;

FIG. 6A is a schematic view of a second pixel unit according to anembodiment of the disclosure;

FIG. 6B is a schematic view of the second pixel unit of FIG. 6A withouta common electrode and a common line.

DESCRIPTION OF THE PRESENT EMBODIMENTS

Reference will now be made in detail to the embodiments of thedisclosure, examples of which are illustrated in the accompanyingdrawings. Wherever possible, the same reference numbers are used in thedrawings and the description to refer to the same or like parts.

In the following description and in the claims, the terms “include”,“comprise” and “have” are used in an open-ended fashion, and thus shouldbe interpreted to mean “include, but not limited to . . . ”.

Although terms such as first, second, third, etc., may be used todescribe diverse constituent elements, such constituent elements are notlimited by the terms. The terms are used only to discriminate aconstituent element from other constituent elements in thespecification. The claims may not use the same terms, but instead mayuse the terms first, second, third, etc. with respect to the order inwhich an element is claimed. Accordingly, in the following description,a first constituent element may be a second constituent element in aclaim.

“A structure (or layer, component, substrate) is referred to as being“disposed on” or “located on” another structure (or layer, component,substrate)” described in this disclosure may refer to the two structuresbeing adjacent and directly connected, or it may mean that the twostructures are adjacent but not directly connected. “Indirectconnection” means that there is at least one intermediary structure (orintermediary layer, intermediary component, intermediary substrate,intermediary space) between the two structures, in which the lowersurface of a structure is adjacent to or directly connected to the uppersurface of the intermediary structure, and the upper surface of theother structure is adjacent to or directly connected to the lowersurface of the intermediary structure. The intermediary structure may bea single-layer or multi-layer physical structure or non-physicalstructure, with no limit. In this disclosure, when a structure isconfigured “on” or “above” another structure, it may mean that thestructure is “directly” on or above another structure, or that thestructure is “indirectly” on or above another structure, with at leastone structure sandwiched between the two structures.

“Electrical connection” or “coupling” described in this disclosure mayrefer to direct connection or indirect connection. In the case of directconnection, the endpoints of the components on two circuits may bedirectly connected or connected to each other via conductor segments. Inthe case of indirect connection, the endpoints of the components on twocircuits may include a combination of one of the switch, diode,capacitor, inductor, or other components of non-conductor segments andat least one conductive segment or resistor, or a combination of atleast two of the above and at least one conductive segment or resistor,but the disclosure is not limited thereto.

The display device described in this disclosure can be applied tovarious electronic devices, including the display device, antennadevice, sensing device or tiled device, but the disclosure is notlimited thereto. The electronic device may be an inflexible or flexibleelectronic device, and may include, for example, the liquid crystal,light-emitting diode, fluorescence, phosphor, or other suitablematerials in any arbitrary arrangement or combination, but thedisclosure is not limited thereto. The light emitting diode may include,for example, the organic light emitting diode (OLED), sub-millimeterlight-emitting diode (mini LED), micro light-emitting diode (micro LED)or quantum dot (QD, for example, QLED, QDLED), but the disclosure is notlimited thereto. The antenna device may be, for example, a liquidcrystal antenna, but the disclosure is not limited thereto. The tileddevice may be, for example, a display tiled device or an antenna tileddevice, but the disclosure is not limited thereto. It should be notedthat the electronic device may be any arbitrary arrangement andcombination described above, but the disclosure is not limited thereto.A display device will be used as an electronic device or tiled device toexplain the contents of the disclosure, but the disclosure is notlimited thereto.

In the disclosure, the various embodiments described below may be mixedand matched without departing from the spirit and scope of thedisclosure. For example, some features of one embodiment may be combinedwith some features of another embodiment to form another embodiment.

Reference will now be made in detail to the exemplary embodiments of thedisclosure, examples of which are illustrated in the drawings. Whereverpossible, the same component numerals are used in the drawings anddescriptions to refer to the same or similar parts.

FIG. 1 is a schematic cross-sectional view of a display device accordingto an embodiment of the disclosure; In FIG. 1, a display device 10includes a first display panel 100 and a second display panel 200disposed above the first display panel 100. In this embodiment, thesecond display panel 200 may be attached to the first display panel 100through an adhesive layer AD. The adhesive layer AD may have a hollowsquare shape in the top view, or may be disposed with the entire surfacecoated between the first display panel 100 and the second display panel200, but the disclosure is not limited thereto. In addition, the displaydevice 10 further includes a diffuser DS disposed between the firstdisplay panel 100 and the second display panel 200. Specifically, thediffuser DS may be, for example, a light diffuser adapted to scatter thelight traveling from the first display panel 100 toward the seconddisplay panel 200. The diffuser DS may be attached to an upper surface100T of the first display panel 100; the adhesive layer AD may bedisposed on the diffuser DS, and the second display panel 200 may beattached to the first display panel 100 through the adhesive layer AD.In some embodiments, the diffuser DS may be integrated in the seconddisplay panel 200. In this embodiment, the first display panel 100 maybe positioned farther away from the viewer/user than the second displaypanel 200. The second display panel 200 may be used to display colorinformation of the screen, and the first display panel 100 may provide aregionalized brightness adjustment function. In this way, the firstdisplay panel 100 and the second display panel 200 work together toachieve a higher contrast display effect.

In this embodiment, the first display panel 100 includes a substrate110, another substrate 120, a display medium 130, and a first pixel unit140. The substrate 110 and the substrate 120 are paired up and down, andthe display medium 130 is disposed between the substrate 110 and thesubstrate 120. The substrate 110 and the substrate 120 may each be atransparent substrate, such as a transparent plastic substrate or aglass substrate. For example, the materials of the substrate 110 and thesubstrate 120 may include glass, quartz, sapphire, ceramic,polycarbonate (PC), polyimide (PI), polyethylene terephthalate (PET),glass fiber, other suitable substrate materials, or a combination of theabove, but the disclosure is not limited thereto. The material of thedisplay medium 130 may include liquid crystal material, electrowettingdisplay material, electrophoretic display material, other suitablematerials, or a combination of the above, but the disclosure is notlimited thereto. The first pixel unit 140 is disposed, for example, onthe substrate 110 and located between the display medium 130 and thesubstrate 110. The first pixel unit 140 is used to provide a drivingelectric field to drive the display medium 130 to achieve a desireddisplay effect.

In this embodiment, the first pixel unit 140 may include at least afirst sub-pixel 142 and a second sub-pixel 144; the first sub-pixel 142and the second sub-pixel 144 are connected in parallel, or the firstsub-pixel 142 is electrically connected to the second sub-pixel 144. InFIG. 1, a dotted line is shown connecting the first sub-pixel 142 andthe second sub-pixel 144 to demonstrate the electrical connectionbetween the first sub-pixel 142 and the second sub-pixel 144. Thespecific connection between the first sub-pixel 142 and the secondsub-pixel 144 will be described below.

In some embodiments, the display medium 130 of the first display panel100 may be a liquid crystal material and the first display panel 100further includes a polarizing film 150, another polarizing film 160, anda transparent conductive layer 170. The polarizing film 150 is disposedon a side of the substrate 110, the polarizing film 160 is disposed on aside of the substrate 120, and the transparent conductive layer 170 isdisposed between the substrate 120 and the polarizing film 160. Thesubstrate 110 and the substrate 120 are disposed between the polarizingfilm 150 and the polarizing film 160, and the display medium 130 and thefirst pixel unit 140 are disposed between the substrate 110 and thesubstrate 120. The transparent conductive layer 170 may be used toprovide an antistatic effect to reduce the probability of the firstdisplay panel 100 being damaged due to static electricity. In otherembodiments, the transparent conductive layer 170 may also be omitted.The polarization directions of the polarizing film 150 and thepolarizing film 160 may cross each other or be parallel to each other.In addition, the first display panel 100 may provide a brightnessadjustment function without having a color adjustment function.Therefore, the first display panel 100 may not include a componentrelated to color filter.

The second display panel 200 includes a substrate 210, another substrate220, a display medium 230, and a second pixel unit 240. The substrate210 and the substrate 220 are paired up and down, and the display medium230 is disposed between the substrate 210 and the substrate 220. Thesecond pixel unit 240 is disposed, for example, between the substrate210 and the substrate 220. The second pixel unit 240 is used to providea driving electric field to drive the display medium 230 to achieve adesired display effect. The material of the display medium 230 may bethe same as or different from the display medium 130 of the firstdisplay panel 100, but the disclosure is not limited thereto. The seconddisplay panel 200 may further include a polarizing film 250, anotherpolarizing film 260, and a transparent conductive layer 270. Thepolarizing film 250 is disposed on a side of the substrate 210, thepolarizing film 260 is disposed on a side of the substrate 220, and thetransparent conductive layer 270 is disposed between the substrate 220and the polarizing film 260. The substrate 210 and the substrate 220 aredisposed between the polarizing film 250 and the polarizing film 260,and the display medium 230 and the second pixel unit 240 are disposedbetween the substrate 210 and the substrate 220. The transparentconductive layer 270 may be used to provide an antistatic effect toreduce the probability of the second display panel 200 being damaged dueto static electricity. In other embodiments, the transparent conductivelayer 270 may also be omitted or be replaced with other components. Insome embodiments, the diffuser DS may be integrated with the polarizingfilm 250 to form a polarizing film with the function of light diffusion.Therefore, the diffuser DS between the first display panel 100 and thesecond display panel 200 may be omitted.

In this embodiment, the second pixel unit 240 includes multiplesub-pixels, for example, a first sub-pixel 242, a second sub-pixel 244,and a third sub-pixel 246. Specifically, the first sub-pixel 242 mayinclude a driving layer 242A and a color filter 242B, the secondsub-pixel 244 may include a driving layer 244A and a color filter 244B,and the third sub-pixel 246 may include a driving layer 246A and a colorfilter 246B. The driving layer 242A, the driving layer 244A, and thedriving layer 246A may each include components such as an activecomponent (not shown) and a pixel electrode (not shown), and are adaptedto generate a driving electric field to drive the display medium 230.The color filter 242B, the color filter 244B, and the color filter 246Beach are filter structures of different colors, respectively. Forexample, in some embodiments, the color filter 242B, the color filter244B, and the color filter 246B are a red filter layer, a green filterlayer, and a blue filter layer, respectively. In this embodiment, thedriving layer 242A, the driving layer 244A, and the driving layer 246Aare used to receive different data signals, respectively, to display thecorresponding color grayscale independently. The first sub-pixel 242,the second sub-pixel 244, and the third sub-pixel 246 are electricallyindependent of each other, and the first sub-pixel 242, the secondsub-pixel 244, and the third sub-pixel 246 are used to display differentcolors, respectively. In this way, the first sub-pixel 242, the secondsub-pixel 244, and the third sub-pixel 246 are used together to displaythe desired color information in the screen information. In someembodiments, the color filter 242B, the color filter 244B, and the colorfilter 246B may be filter structures of the same color, but thedisclosure is not limited thereto.

When the display device 10 displays a screen, the first pixel unit 140may be used to adjust the brightness of a corresponding area accordingto the contrast information in the screen information, and the secondpixel unit 240 may be used to adjust a corresponding color grayscaleaccording to the color information in the screen information. In thisway, two second pixel units 240 having the same color grayscale cancorrespond to the first pixel units 140 of different brightnesses, sothat the display device 10 can display a screen of high-contrast, andthe display quality of the display device 10 can be improved. Inaddition, in this embodiment, under specific condition, the firstsub-pixel 142 and the second sub-pixel 144 of the first pixel unit 140may be electrically connected to each other and display the samebrightness. In an embodiment, the first sub-pixel 142 and the secondsub-pixel 144 are connected in parallel. In another embodiment, thefirst sub-pixel 142 and the second sub-pixel 144 may be electricallyconnected to a data line DL at the same time to receive the same data,and/or electrically connected to a same active layer SE at the same timeto receive the same data. Once one of the first sub-pixel 142 or thesecond sub-pixel 144 cannot display properly due to defects in themanufacturing process (such as an unexpected short circuit or opencircuit caused by particle contamination in the manufacturing process,but the disclosure is not limited thereto), the other one can stilldisplay normally so that some of the first pixel units 140 can operateproperly without compromising the entire first pixel unit 140. In otherwords, in the display device 10, even if there are invalid sub-pixelsthat cannot display properly, at least the other sub-pixel can be usedto display, thus reducing the degree of deterioration of the displayeffect.

In the display device 10, one first pixel unit 140 may be disposedcorresponding to N second pixel units 240, where N is a any value largerthan 0 to 20 (0<N≤20). In other words, one first pixel unit 140 maycorrespond to one second pixel unit 240 or half a second pixel unit 240,and may correspond to multiple second pixel units, or even up to 20second pixel units 240. The first pixel unit 140 may have a first pixelelectrode area 140R, where the first pixel electrode area 140R may beregarded as the sum of the pixel electrode area of the first sub-pixel142 and the pixel electrode area of the second sub-pixel 144. Inaddition, the second pixel unit 240 may have a second pixel electrodearea 240R, where the second pixel electrode area 240R may be regarded asthe sum of the pixel electrode area of the first sub-pixel 242, thepixel electrode area of the second sub-pixel 244, and the pixelelectrode area of the third sub-pixel 246. In detail, “corresponding”means that the first pixel electrode area 140R is overlapped with atleast 50% of the second pixel electrode area 240R.

FIG. 2 is a schematic exploded view of a display device according to anembodiment of the disclosure. In FIG. 2, a display device 20 includesthe first display panel 100, the second display panel 200, and abacklight module 300A; the first display panel 100 and the seconddisplay panel 200 may be sequentially stacked on the backlight module300A, and the first display panel 100 is located between the seconddisplay panel 200 and the backlight module 300A. The first display panel100 and the second display panel 200 may be similar to the first displaypanel 100 and the second display panel 200 in the display device 10 ofFIG. 1, therefore the same or similar numerals will be used for the sameor similar components in the two embodiments. In FIG. 2, to simplify thedrawings, some components of the first display panel 100 and the seconddisplay panel 200 are omitted; other components between the firstdisplay panel 100 and the second display panel 200 as well as betweenthe first display panel and the backlight module 300 are also omitted.However, it can be understood with reference to the present embodimentof FIG. 1 that components such as the adhesive layer AD and the diffuserDS may be additionally disposed between the first display panel 100 andthe second display panel 200, but the disclosure is not limited thereto.

FIG. 2 only shows the first sub-pixel 142 and the second sub-pixel 144in one of the multiple first pixel units 140 in the first display panel100, and also further shows a drive circuit DC1. In some embodiments,the drive circuit DC1 may be selectively disposed at any other suitablelocation in the first display panel 100, but the disclosure is notlimited thereto. For other components of the first display panel 100,reference can be made to the present embodiment of FIG. 1. Similarly,FIG. 2 only shows the first sub-pixel 242, the second sub-pixel 244, andthe third sub-pixel 246 of the second pixel unit 240 in the seconddisplay panel 200 and further shows a drive circuit DC2. In someembodiments, the drive circuit DC2 may be selectively disposed at anyother suitable location in the second display panel 200, but thedisclosure is not limited thereto. For other components of the firstdisplay panel 100, reference may be made to the present embodiment ofFIG. 1. The drive circuit DC1 on the first display panel 100 may be usedto provide a driving signal to the first pixel unit 140, and, underspecific condition, the first sub-pixel 142 and the second sub-pixel 144of the first pixel unit 140 may be electrically connected to each otherand display the same brightness. In an embodiment, the first sub-pixel142 and the second sub-pixel 144 are connected in parallel. In anotherembodiment, the first sub-pixel 142 and the second sub-pixel 144 may beelectrically connected to the data line DL at the same time to receivethe same data, and/or electrically connected to the same active layer SEat the same time to receive the same data. Therefore, the firstsub-pixel 142 and the second sub-pixel 144 may be used to display thesame brightness. The drive circuit DC2 on the second display panel 200may be used to provide data signals to the first sub-pixel 242, thesecond sub-pixel 244, and the third sub-pixel 246 of the second pixelunit 240. Since the first sub-pixel 242, the second sub-pixel 244, andthe third sub-pixel 246 are electrically independent of each other, andare used to display different color grayscales, the drive circuit DC2 onthe second display panel 200 may be used to provide different datasignals to the first sub-pixel 242, the second sub-pixel 244, and thethird sub-pixel 246, respectively.

The backlight module 300A includes a light source 310A and a light guideplate 320A. In some embodiments, the backlight module 300A may furtherinclude a diffuser (not shown), a prism film (not shown), or othersuitable components, but the disclosure is not limited thereto. Thelight source 310A includes one or more light- emitting components 312A,and is located on a side the of the light guide plate 320A. In this way,the light source 310A is used to emit light toward a side of the lightguide plate 320A to form a side-type backlight module. In thisembodiment, the light-mitting component 312A includes multiplelight-emitting diodes, lamps, or other light-emitting components thatmay be disposed on the side of the light guide plate 320A to emit lighttoward a side of the light guide plate 320A. The light emitted by thelight source 310A may be distributed in the entire area of the lightguide plate 320A through the light guide plate 320A and emitted towardthe first display panel 100. The first display panel 100 may adjust thebrightness of each first pixel unit 140 according to the required screeninformation so that the light emitted toward the second display panel200 has a corresponding intensity. In this way, the display device 20can provide high-contrast display quality.

FIG. 3 is a schematic exploded view of a display device according toanother embodiment of the disclosure. In FIG. 3, a display device 30includes the first display panel 100, the second display panel 200, anda backlight module 300B. The first display panel 100 and the seconddisplay panel 200 may be sequentially stacked above the backlight module300B, and the first display panel 100 is located between the seconddisplay panel 200 and the backlight module 300B. Specifically, thedisplay device 30 of this embodiment is similar to the display device 20of FIG. 2, therefore the same or similar components in the twoembodiments will not be repeated here. The main difference between thisembodiment and the display device 20 is the design of the backlightmodule 300B. In this embodiment; the backlight module 300B includesmultiple light-emitting components 312B and a back frame 320B, and themultiple light-emitting components 312B may be disposed in the backframe 320B. The light-emitting component 312B may be disposed in theback frame 320B in an array arrangement. In other words, the backlightmodule 300B is a direct-type backlight module. The light-emittingcomponent 312B may be, for example, a point light-emitting component ora linear light-emitting component; the point light-emitting componentincludes a light-emitting diode, and the linear light-emitting componentincludes a lamp, but the disclosure is not limited thereto. The backframe 320B may include a backsheet (not shown), and the light-emittingcomponent 312B is disposed on the backsheet. In this way, the backsheetin the back frame 320B can reflect the light emitted by thelight-emitting component 312B toward the first display panel 100. Insome embodiments, the backlight module 300B may further include adiffuser (not shown), a prism film (not shown), or other suitablecomponents, but the disclosure is not limited thereto.

FIG. 4A is a schematic view of a first pixel unit according to anembodiment, and FIG. 4B is a schematic view of the first pixel unit ofFIG. 4A without the common electrode and the common line. Referring toFIG. 4A and FIG. 4B, a first pixel unit 140A may be applied to any oneof the display device 10, the display device 20, or the display device30 mentioned above and be disposed in the first display panel 100 as away of implementing the first pixel unit 140 described in the aboveembodiment. The first pixel unit 140A may include, for example, anactive component AC1, a first sub-pixel 142A, and a second sub-pixel144A, where the first sub-pixel 142A may include a first sub-pixelelectrode PE1, and the second sub-pixel 144A may include a secondsub-pixel electrode PE2. The first sub-pixel electrode PE1 and thesecond sub-pixel electrode PE2 are respectively connected to the activecomponent AC1, and the active component AC1 is connected to a scan lineSL and the data line DL. The scan line SL intersects the data line DL,and the active component AC1 is disposed at the intersection of the scanline SL and the data line DL. The first sub-pixel electrode PE1 and thesecond sub-pixel electrode PE2 may be electrically connected to eachother under the specific condition that the active component AC1 isswitched on and display the same brightness. In an embodiment, the firstsub-pixel electrode PE1 and the second sub-pixel electrode PE2 areconnected in parallel. In another embodiment, the first sub-pixelelectrode PE1 and the second sub-pixel electrode PE2 may be electricallyconnected to the data line DL at the same time to receive the same datafrom the data line, and/or may be electrically connected to the sameactive layer SE at the same time to receive the same data.

In addition, the first pixel unit 140A may further include a commonelectrode CE, and the common electrode CE may be at least partiallyoverlapped with the first sub-pixel electrode PE1 and/or at leastpartially overlapped with the second sub-pixel electrode PE2, oroverlapped with more other sub-pixel electrodes; here the range or areaof the common electrode CE is not limited. In some embodiments, thefirst pixel unit 140A may further include a common line CM, and thecommon electrode CE and the common line CM may be electrically connectedto each other through a contact hole CMV. In this embodiment, the commonelectrode CE may have multiple slit STs, and the slit ST may be at leastpartially overlapped with the first sub-pixel electrode PE1 and also atleast partially overlapped with the second sub-pixel electrode PE2. Inthis way, when a corresponding signal or voltage is input to the commonelectrode CE, the first sub-pixel electrode PE1 and the second sub-pixelelectrode PE2, a driving electric field may be generated at the edge ofthe slit ST to drive the display medium in the display panel. When thefirst pixel unit 140A is applied to the first display panel 100 of theabove embodiment, the first sub-pixel electrode PE1 and the secondsub-pixel electrode PE2 may be disposed between the substrate 110 (shownin FIG. 1) and the common electrode CE. In some embodiments, when thefirst pixel unit 140A is applied to the first display panel 100 of theabove embodiment, the common electrode CE may be located between thesubstrate 110 (shown in FIG. 1) and the first sub-pixel electrode PE1and between the substrate 110 (shown in FIG. 1) and the second sub-pixelelectrode PE2. At this time, the first sub-pixel electrode PE1 and thesecond sub-pixel electrode PE2 may be provided with the slit ST. Here,the first pixel unit 140A is, for example, a fringe-field switch typepixel but the disclosure is not limited thereto. In other embodiments,the first pixel unit 140A may be a Vertical Alignment type pixel, aTwisted-Nematic type pixel, or other types of pixels, but the disclosureis not limited thereto.

In this embodiment, the patterns of the first sub-pixel electrode PE1and the second sub-pixel electrode PE2 are independent of each otherwithout connection. However, both the first sub-pixel electrode PE1 andthe second sub-pixel electrode PE2 are connected to the active componentAC1, and the active component AC1 may be driven by the single scan lineSL and transmit the signals on the single data line DL to both the firstsub-pixel electrode PE1 and the second sub-pixel electrode PE2. In thisway, the first sub-pixel 142A and the second sub-pixel 144A can beelectrically connected to each other at least when the active componentAC1 is switched to the ON state.

The active component AC1 includes, for example, the active layer SE, asource SD1, a first drain SD2A, and a second drain SD2B. The material ofthe active layer SE may include, for example, indium gallium zinc oxide(IGZO), indium tin zinc oxide (ITZO), other metal oxides, or acombination of the above, but the disclosure is not limited thereto. Inthis embodiment, the active layer SE may be overlapped with the scanline SL and display a high carrier mobility (ON state) or a low carriermobility (OFF state) according to the signals transmitted on the scanline SL. Therefore, the part of the scan line SL that is overlapped withthe active layer SE may be regarded as a gate GE of the active componentAC1. The source SD1 may include a first part SD1A and a second partSD1B; both the first part SD1A and the second part SD1B are connected tothe data line DL, and both are at least partially overlapped with theactive layer SE. In this embodiment, the materials of the first drainSD2A and the second drain SD2B may include transparent conductivematerial, metal material, other suitable materials, or combinations ofthe above, but the disclosure is not limited thereto. The transparentconductive material may include, for example, indium tin oxide, indiumzinc oxide, indium oxide, zinc oxide, tin oxide, organic conductivematerial, other suitable materials, or a combination of the above, butthe disclosure is not limited thereto. The metal material may include,for example, aluminum, molybdenum, copper, silver, other suitablematerials, or a combination of the above, but the disclosure is notlimited thereto. In addition, the materials of the source SD1, the firstdrain SD2A and the second drain SD2B may be the same as the data lineDL, or may include other materials.

The first drain SD2A corresponds to the first part SD1A of the sourceSD1 is at least partially overlapped with the active layer SE, and thesecond drain SD2B corresponds to the second part SD1B of the source SD1is at least partially overlapped with the active layer SE. The firstdrain SD2A and the second drain SD2B are two electrodes that areindependent of each other in terms of pattern profile, but both areoverlapped with the active layer SE. In addition, both the first partSD1A corresponding to the first drain SD2A and the second part SD1Bcorresponding to the second drain SD2B are connected to the data lineDL. In this way, when the active layer SE is controlled by the signalson the gate GE and displays a high carrier mobility, the data signals onthe data line DL can be transmitted from the first part SD1A to thefirst drain SD2A and from the second part SD1B to the second drain SD2B.In other words, the gate GE is adapted to drive the active layer SE toallow the signals of the source SD1 to be transmitted to the first drainSD2A and the second drain SD2B. Therefore, the first drain SD2A and thesecond drain SD2B are electrically connected to each other when theactive component AC1 assumes the ON state. In addition, the firstsub-pixel electrode PE1 is connected to the first drain SD2A and thesecond sub-pixel electrode PE2 is connected to the second drain SD2B.Therefore, the first sub-pixel electrode PE1 and the second sub-pixelelectrode PE2 may be electrically connected to each other when theactive component AC1 is switched to the ON state.

The first sub-pixel electrode PE1 and the second sub-pixel electrode PE2are independent of each other in terms of pattern profile; the firstdrain SD2A and the second drain SD2B are also independent of each otherin terms of pattern profile. In an embodiment, the first sub-pixel 142and the second sub-pixel 144 are connected in parallel. In anotherembodiment, the first sub-pixel 142 and the second sub-pixel 144 may beelectrically connected to the data line DL at the same time to receivethe same data, and/or electrically connected to the same active layer SEat the same time to receive the same data. If a defect occurs in theprocess of making the first pixel unit 140A (for example, an unexpectedshort circuit or open circuit due to particle contamination in theprocess) and one of the first sub-pixel electrode PE1 or the secondsub-pixel electrode PE2 cannot display properly, the other can stilldisplay normally. Therefore, the structural design of the first pixelunit 140A helps to improve the yield of the display device, in which afailed sub-pixel may be compensated by the other sub-pixel electricallyconnected thereto without causing the entire first pixel unit 140A tofail.

In this embodiment, the data line DL is located between the firstsub-pixel electrode PE1 and the second sub-pixel electrode PE2, but thedisclosure is not limited thereto. For example, in other embodiments,the first sub-pixel electrode PE1 may be located between the secondsub-pixel electrode PE2 and the data line DL. In this embodiment, thescan line SL is described to be located on a side of the first sub-pixelelectrode PE1 and the second sub-pixel electrode PE2, but the disclosureis not limited thereto. Moreover, the first pixel electrode area 140R ofthe first pixel unit 140A may be understood as the sum of the area ofthe first sub-pixel electrode PE1 and the area of the second sub-pixelelectrode PE2. In addition, the area of the first sub-pixel electrodePE1 and the area of the second sub-pixel electrode PE2 may be the sameas or different from each other.

FIG. 5 is a schematic view of a first pixel unit according to anotherembodiment without the common electrode of the first pixel unit. In FIG.5, a first pixel unit 140B may include, for example, an active componentAC2, a first sub-pixel 142B, a second sub-pixel 144B, and a thirdsub-pixel 146B, where the first sub-pixel 142B may include the firstsub-pixel electrode PE1, the second sub-pixel 144B may include thesecond sub-pixel electrode PE2, and the third sub-pixel 146B may includea third sub-pixel electrode PE3. In this embodiment, the first sub-pixel142B, the second sub-pixel 144B, and the third sub-pixel 146B may beelectrically connected to each other under the specific condition thatthe active component AC2 is switched on and display the same brightness.In an embodiment, the first sub-pixel 142B, the second sub-pixel 144B,and the third sub-pixel 146B are connected in parallel. In anotherembodiment, the first sub-pixel 142B, the second sub-pixel 144B, and thethird sub-pixel 146B may be electrically connected to the data line DLat the same time to receive the same data from the data line DL, and/ormay be electrically connected to the same active layer SE at the sametime to receive the same data. The first pixel unit 140B may furtherinclude a common electrode (not shown), and the common electrode (notshown) may, just as the common electrode CE of FIG. 4A, is at leastpartially overlapped with the first sub-pixel electrode PE1, the secondsub-pixel electrode PE2, and the third sub-pixel electrode PE3, and isprovided with the slit ST as shown in FIG. 4A, but the disclosure is notlimited thereto. The first sub-pixel electrode PE1, the second sub-pixelelectrode PE2 and the third sub-pixel electrode PE3 are respectivelyconnected to the active component AC2, and the active component AC2 isconnected to the scan line SL and the data line DL. The scan line SLintersects the data line DL, and the active component AC2 is disposed atthe intersection of the scan line SL and the data line DL. In thisembodiment, the data line DL is located on a side of the first pixelunit 140B, and the first sub-pixel 142B and the second sub-pixel 144Bare both located between the data line DL and the third sub-pixel 146B.Therefore, the third sub-pixel 146B is farther away from the data lineDL than the first sub-pixel 142B and the second sub- pixel 144B, and thesecond sub-pixel 144B is farther away from the data line DL than thefirst sub-pixel 142B. In addition, in some embodiments, the thirdsub-pixel 146B of the first pixel unit 140B may be omitted and only twosub-pixels are provided (i.e., the first sub-pixel 142B and the secondsub-pixel 144B). When the first pixel unit 140B is applied to thedisplay device 10, the display device 20 or the display device 30 of theabove embodiment, a first pixel electrode area 140BR of the first pixelunit 140B may be understood as the sum of the area of the firstsub-pixel electrode PE1, the area of the second sub-pixel electrode PE2,and the area of the third sub-pixel electrode PE3. In some embodiments,the first pixel unit may include at least three sub-pixels, and eachsub-pixel is connected in parallel with each other, but the disclosureis not limited thereto. In another embodiment, each sub-pixel in thesame pixel unit may be electrically connected to the data line DL at thesame time to receive the same data from the data line DL, and/or may beelectrically connected to the same active layer SE at the same time toreceive the same data.

The active component AC2 may include the gate GE, the active layer SE,the source SD1, the first drain SD2A, the second drain SD2B, and a thirddrain SD2C. The active layer SE is partially overlapped with the scanline SL, and the part of the scan line SL that is overlapped with theactive layer SE may be regarded as the gate GE. The source SD1 isconnected to the data line DL and is at least partially overlapped withthe active layer SE. The pattern profiles of the first drain SD2A, thesecond drain SD2B, and the third drain SD2C are independent of eachother without connection. The first drain SD2A, the second drain SD2B,and the third drain SD2C all are at least partially overlapped with theactive layer SE and all correspond to the source SD1. The firstsub-pixel electrode PE1 is connected to the first drain SD2A, the secondsub-pixel electrode PE2 is connected to the second drain SD2B, and thethird sub-pixel electrode PE3 is connected to the third drain SD2C.

The first sub-pixel electrode PE1, the second sub-pixel electrode PE2,and the third sub-pixel electrode PE3 have independent pattern profilesfrom each other, and the pattern profiles of the first drain SD2A, thesecond drain SD2B, and the third drain SD2C are also independent of eachother. The gate GE is adapted to drive the active layer SE so that theactive layer SE can have high carrier mobility, and the signals on thedata line DL can be transmitted from the source SD1 to the first drainSD2A, the second drain SD2B, and the third drain SD2C and be input tothe first sub-pixel electrode PE1, the second sub-pixel electrode PE2,and the third sub-pixel electrode PE3. Therefore, when the activecomponent AC2 assumes the ON state, the first sub-pixel 142B, the secondsub-pixel 144B, and the third sub-pixel 146B may be electricallyconnected to each other.

In this embodiment, the first sub-pixel 142B, the second sub-pixel 144B,and the third sub-pixel 146B each further include a pixel connectionelectrode CPE1, a pixel connection electrode CPE2 and a pixel connectionelectrode CPE3, where the first sub-pixel electrode PE1, the secondsub-pixel electrode PE2 and the third sub-pixel electrode PE3 each arerespectively electrically connected and/or directly connected to thefirst drain SD2A, the second drain SD2B, and the third drain SD2Cthrough, for example, the corresponding pixel connection electrode CPE1,the pixel connection electrode CPE2 and the pixel connection electrodeCPE3. In an embodiment, the third sub-pixel 146B is farther away fromthe data line DL than the first sub-pixel 142B and the second sub-pixel144B. In another embodiment, the pixel connection electrode CPE1, thepixel connection electrode CPE2, and the pixel connection electrode CPE3may be electrically connected to each other under the specific conditionthat the active component AC1 is switched on and display the samebrightness. In yet another embodiment, the pixel connection electrodeCPE1, the pixel connection electrode CPE2 and the pixel connectionelectrode CPE3 are connected in parallel. In another embodiment, thepixel connection electrode CPE1, the pixel connection electrode CPE2,and the pixel connection electrode may be electrically connected to thedata line DL at the same time to receive the same data from the dataline DL, and/or may be electrically connected to the same active layerSE at the same time to receive the same data. The materials of the pixelconnection electrode CPE1, the pixel connection electrode CPE2 and thepixel connection electrode CPE3 may be transparent conductive materials.In some embodiments, the materials of the pixel connection electrodeCPE1, the pixel connection electrode CPE2 and the pixel connectionelectrode CPE3 may be the same as the first sub-pixel electrode PE1, thesecond sub-pixel electrode PE2 and the third sub-pixel electrode PE3. Inthis way, the pixel connection electrode CPE1, the pixel connectionelectrode CPE2, and the pixel connection electrode CPE3 may also belight-transmissive, which helps to increase the area of the displayregion of the first pixel unit 140B(or increase the aperture ratio ofthe first pixel unit 140B). In this embodiment, the areas of the firstsub-pixel electrode PE1, the second sub-pixel electrode PE2, and thethird sub-pixel electrode PE3 may be the same as or different from eachother. In this embodiment, in the extending direction of the scan lineSL, the length of the pixel connection electrode CPE2 is longer than thepixel connection electrode CPE1, and the pixel connection electrode CPE3is longer than the pixel connection electrode CPE2 and/or the pixelconnection electrode CPE1. In addition, the data line DL may be locatedbetween any two of the first sub-pixel electrode PE1, the secondsub-pixel electrode PE2, and the third sub-pixel electrode PE3.

FIG. 6A is a schematic view of a second pixel unit according to anembodiment of the disclosure, and FIG. 6B is a schematic view of thesecond pixel unit of FIG. 6A without the common electrode and the commonline. In FIG. 6A and FIG. 6B, a second pixel unit 240A may include afirst sub-pixel 242P, a second sub-pixel 244P, and a third sub-pixel246P. The first sub-pixel 242P, the second sub-pixel 244P and the thirdsub-pixel 246P may include the driving layer 242A, the driving layer244A the driving layer 246A, the color filter 242B, the color filter244B, and the color filter 246B as shown in FIG. 1, although FIG. 6A andFIG. 6B mainly show the driving layer of each sub-pixel without thecolor filter. In this embodiment, the driving layers of the firstsub-pixel 242P, the second sub-pixel 244P, and the third sub-pixel 246Pare similar to each other, therefore the structure of the firstsub-pixel 242P will be described as an example below. The driving layerof the first sub-pixel 242P may include a pixel electrode PE and anactive component AC3, where the active component AC3 is connected to thescan line SL and the data line DL, and active component AC3 is locatedat the intersection of the scan line SL and the data line DL, but thedisclosure is not limited thereto. The active component AC3 includes thegate GE, the active layer SE, the source SD1 and a drain SD2, where theactive layer SE is partially overlapped with the scan line SL, and thepart of the scan line SL that is overlapped with the active layer SE canbe regarded as the gate GE of the active component AC3. Both the sourceSD1 and the drain SD2 are overlapped with the active layer SE and areseparated from each other. In addition, the second pixel unit 240A mayfurther include the common electrode CE. The pixel electrode PE isconnected to the drain SD2, and the common electrode CE may be at leastpartially overlapped with the pixel electrode PE, or overlapped withmore other pixel electrodes; here the range or area of the commonelectrode CE is not limited. The gate GE can drive the active layer SEto allow the source SD1 and the drain SD2 signals to connect. In someembodiments, the second pixel unit 240A may further include the commonline CM, and the common electrode CE and the common line CM may beelectrically connected to each other through the contact hole CMV. Inthe second pixel unit 240A, three data line DLs may be provided, such asa first data line DL1, a second data line DL2, and a third data lineDL3, where the first sub-pixel 242P, the second sub-pixel 244P and thethird sub-pixel 246P are respectively connected to the first data lineDL1, the second data line DL2 and the third data line DL3. Therefore,the first sub-pixel 242P, the second sub-pixel 244P, and the thirdsub-pixel 246P are electrically independent, with the signalsindependent of each other. The second pixel unit 240A of FIG. 6A may beapplied to the display device 10, the display device 20, or the displaydevice 30 as a possible way of implementing the second pixel unit 240described in the above embodiment. In addition, the common electrode CEand its corresponding common line CM are omitted in FIG. 6B so that theprofile of the pixel electrode PE can be more clearly understood.

One of the first pixel unit 140As of FIG. 4A and the first pixel unit140B of FIG. 5 may be applied to the display device 10, the displaydevice 20, or the display device 30 of the above embodiment inconjunction with the second pixel unit 240A of FIG. 6A. Thus, a secondpixel electrode area 240AR of the second pixel unit 240A may be regardedas the sum of the area of the pixel electrode PE of the first sub-pixel242P, the area of the pixel electrode PE of the second sub-pixel 244P,and the area of the pixel electrode PE of the third sub-pixel 246P. Thesecond pixel electrode area 240AR may overlap approximately 50% of thesum of the area of the first sub-pixel electrode PE1 and the area of thesecond sub-pixel electrode PE2 in the first pixel unit 140A (the firstpixel electrode area 140AR in the first pixel unit 140A); in otherwords, the first pixel unit 140A corresponds to the second pixel unit240A. Or, the second pixel electrode area 240AR may overlapapproximately 50% of the sum of the area of the first sub-pixelelectrode PE1, the area of the second sub-pixel electrode PE2, and thearea of the third sub-pixel electrode PE3 in the first pixel unit 140B(the first pixel electrode area 140BR of the first pixel unit 140B); inother words, the first pixel unit 140B corresponds to the second pixelunit 240A.

In some embodiments, the first pixel electrode area of the first pixelunit 140A or the first pixel unit 140B (for example, the first pixelelectrode area 140AR or the first pixel electrode area 140BR) may be thesame as or different from the second pixel electrode area 240AR of thesecond pixel unit 240A, but the disclosure is not limited thereto. Whenless than 50% of the second pixel electrode area 240AR of the secondpixel unit 240A overlaps the first pixel electrode area of the firstpixel unit 240A or of the first pixel unit 140B, the display device 10,the display device 20, or the display device 30 may adjust the displaymode of the second pixel unit 240A through algorithm of the drivecircuit to achieve the desired display effect.

In summary, the display device of the disclosed embodiments includes adual panel, where the first display panel is used to adjust thebrightness, and the second display panel is used to display the colorinformation of the screen. The first display panel includes a firstpixel unit and the second display panel includes a second pixel unit.The first pixel unit includes at least a first sub-pixel and a secondsub-pixel connected in parallel. In the process of making the displaydevice, if any one of the first sub-pixel or the second sub-pixel of thesame first pixel unit cannot display properly, at least the other canstill provide the display function. Therefore, when some sub-pixels ofthe first pixel unit fail, the display device can still provide a normaldisplay effect, thereby improving the yield of the display device.

Finally, it should be noted that the above embodiments are only used toillustrate the technical solutions of the disclosure, rather thanlimiting it; although the disclosure has been described in detail withreference to the above embodiments, persons having ordinary skill in theart should understand that they can still modify the technical solutionsdescribed in the above embodiments, or equivalently replace part or alltechnical features therein while the modifications or replacements donot deviate from the scope of the technical solutions of the presentembodiments of the disclosure.

What is claimed is:
 1. A display device, comprising: a first displaypanel, comprising: a first pixel unit, comprising a first sub-pixel anda second sub-pixel, wherein the first sub-pixel and the second sub-pixelare connected in parallel; and a second display panel, disposed abovethe first display panel.
 2. The display device according to claim 1,wherein the first pixel unit further comprises a third sub-pixel.
 3. Thedisplay device according to claim 2, wherein the third sub-pixel, thefirst sub-pixel, and the second sub-pixel are connected in parallel. 4.The display device according to claim 1, wherein the second displaypanel comprises a second pixel unit, the first pixel unit comprises afirst pixel electrode area, the second pixel unit comprises a secondpixel electrode area, and the first pixel electrode area is overlappedwith at least 50% of the second pixel electrode area.
 5. The displaydevice according to claim 4, wherein the first sub-pixel comprises afirst sub-pixel electrode, the second sub-pixel comprises a secondsub-pixel electrode, and the first pixel electrode area is a sum of anarea of first sub-pixel electrode and an area of the second sub-pixelelectrode.
 6. The display device according to claim 4, wherein thesecond pixel unit comprises a plurality of sub-pixels, and each of theplurality of sub-pixels comprises a color filter.
 7. The display deviceaccording to claim 6, wherein a quantity of the plurality of sub-pixelsis three.
 8. The display device according to claim 1, wherein the firstpixel unit further comprises an active component, wherein the firstsub-pixel comprises a first sub-pixel electrode, the second sub-pixelcomprises a second sub-pixel electrode, and both of the first sub-pixelelectrode and the second sub-pixel electrode are electrically connectedto the active component.
 9. The display device according to claim 8,wherein the first display panel further comprises a data line, whereinthe active component is connected to the data line, and the data line islocated between the first sub-pixel electrode and the second sub-pixelelectrode.
 10. The display device according to claim 8, wherein thefirst display panel further comprises a data line, wherein the activecomponent is connected to the data line, and the first sub-pixelelectrode is located between the second sub-pixel electrode and the dataline.
 11. The display device according to claim 8, wherein the firstpixel unit further comprises a pixel connection electrode electricallyconnected between the second sub-pixel electrode and the activecomponent, and the second sub-pixel electrode is farther away from theactive component than the first sub-pixel electrode.
 12. The displaydevice according to claim 1, wherein the second display panel comprisesa second pixel unit, wherein the second pixel unit comprises a pluralityof sub-pixels, and the plurality of sub-pixels are electricallyindependent of each other.
 13. The display device according to claim 1,wherein the first display panel further comprises a substrate and atransparent conductive layer, wherein the transparent conductive layeris disposed on the substrate and adjacent to the second display panel.14. The display device according to claim 13, wherein the first displaypanel further comprises a polarizing film, wherein the transparentconductive layer is disposed between the substrate and the polarizingfilm.
 15. The display device according to claim 1, wherein the seconddisplay panel comprises a substrate, a polarizing film and a transparentconductive layer, wherein the transparent conductive layer is disposedbetween the substrate and the polarizing film.
 16. The display deviceaccording to claim 1, further comprising a diffuser disposed between thefirst display panel and the second display panel.
 17. The display deviceaccording to claim 1, further comprising a backlight module, wherein thefirst display panel is located between the second display panel and thebacklight module.
 18. The display device according to claim 1, whereinthe first display panel further comprises two substrates and a displaymedium disposed between the two substrates.
 19. The display deviceaccording to claim 18, wherein the first pixel unit is disposed betweenone of the two substrates and the display medium.
 20. The display deviceaccording to claim 1, further comprising an adhesive layer, wherein thesecond display panel is attached to the first display panel through theadhesive layer.